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Application of refining grain in titanium alloy
Feb 17, 2017

With a large plastic deformation (SPD) method of grain refinement is concerned, there are many research reports in this area, but in the actual application, the cost and the heat treatment of alloy applicability is still facing many difficulties. Japanese researchers have developed a continuous and efficient production process and can refine the grain processing heat treatment process (RMA-CREO, referred to as CREO). In this method, titanium rod in high-frequency coil of local heating and cooling, low deformation resistance in local area, to the sample in this region applying torsional force, the grain refinement in the shear deformation, refinement of the organized by the mandatory cooling water cooling device to prevent grain coarsening. Continuous deformation can be carried out by heating the torsional deformation by continuous movement in the axial direction. As long as the material can be deformed in the heating state, the CREO method can be used for grain refinement, and the method can be used for aluminum, magnesium, steel, stainless steel, Ti-6Al-4V alloy, copper alloy and other metal materials. Because the CERO method is a non-contact method, it can be used to provide strong strain at high temperature. In the past, the SPD method is often difficult to apply to the heat treated alloy, while the CREO method can be used to improve the performance of the material. The principle and effect of CREO treatment are as follows:


First, the grain refinement effect, that is, the torsional deformation caused by shear deformation, so that the grain elongation, the deformation of the strain will be extended, so that grain refinement. As a result of the short time heating, the equiaxed grains of fine recrystallized grains will be obtained after strain.

Two is to improve the solid solution effect, that is, heating and CREO torsional strain caused by the expansion of interatomic spacing between the solid solution to promote solid solution strengthening.

Three is to control the effect of crystallization direction, namely the main slip plane (0001) has a strong anisotropy of HCP titanium alloy, CREO through anisotropic processing given the texture of a certain angle and control the material. 

Researchers through the pure titanium, Ti-6Al-4V, titanium alloy, such as CREO treatment, confirmed that this method can refine the grain of titanium. Such as the pure titanium CREO treatment, the grain can be from 20 to 100 m refined to 2 ~ 20 m. The researchers will also be processed by the 19mm diameter of pure titanium CREO forged into a radius of about 90mm, thickness of about 3mm disk. The results show that the forging can further refine the grain and improve its performance. In summary, the RMA-CREO method is processing can look forward to a practical production of grain refinement and heat treatment process. In the future, we will explore the practical application of concrete parts.